C# Post调用接口并传递json参数

 1         public string Post(string Url, string jsonParas)
 2         {
 3             string strURL = Url;
 4             //创建一个HTTP请求
 5             HttpWebRequest request = (HttpWebRequest)WebRequest.Create(strURL);
 6             //Post请求方式
 7             request.Method = "POST";
 8             //内容类型
 9             request.ContentType = "application/json";
10
11             //设置参数，并进行URL编码
12
13             string paraUrlCoded = jsonParas;//System.Web.HttpUtility.UrlEncode(jsonParas);
14
15             byte[] payload;
16             //将Json字符串转化为字节
17             payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
18             //设置请求的ContentLength
19             request.ContentLength = payload.Length;
20             //发送请求，获得请求流
21
22             Stream writer;
23             try
24             {
25                 writer = request.GetRequestStream();//获取用于写入请求数据的Stream对象
26             }
27             catch (Exception)
28             {
29                 writer = null;
30                 Console.Write("连接服务器失败!");
31             }
32             //将请求参数写入流
33             writer.Write(payload, 0, payload.Length);
34             writer.Close();//关闭请求流
35                            // String strValue = "";//strValue为http响应所返回的字符流
36             HttpWebResponse response;
37             try
38             {
39                 //获得响应流
40                 response = (HttpWebResponse)request.GetResponse();
41             }
42             catch (WebException ex)
43             {
44                 response = ex.Response as HttpWebResponse;
45             }
46             Stream s = response.GetResponseStream();
47             //  Stream postData = Request.InputStream;
48             StreamReader sRead = new StreamReader(s);
49             string postContent = sRead.ReadToEnd();
50             sRead.Close();
51             return postContent;//返回Json数据
52         }
53         //调用：   string askurl = testUrl + "?sid=" + sid + "&mobi=" + mobi + "&sign=" + sign + "&msg=" + encodeMsgs;
54         //string relust = Post(askurl, "");
55         // 或者  string relust = Post(askurl, sid=" + sid + "&mobi=" + mobi + "&sign=" + sign + "&msg=" + encodeMsgs);

本文链接：https://blog.csdn.net/weixin_43343835/article/details/98959523